v6: remove figure-img from image docs

[coliff]

Description / Motivation & Context

figure-img is not needed/used and not included in Bootstrap CSS.

Type of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (non-breaking change)
• Breaking change (fix or feature that would change existing functionality)

Checklist

• I have read the contributing guidelines
• My code follows the code style of the project (using npm run lint)
• My change introduces changes to the documentation
• I have updated the documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed

Live previews

• https://deploy-preview-42457--twbs-bootstrap.netlify.app/docs/6.0/content/images/#figures

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Documentation update to the Figures section of the images page, fixing a broken sentence and removing references to the .figure-img class from both prose and code examples.

Changes:

• Fixed a broken sentence by adding the missing word "element." after <figure>.
• Removed mentions of the .figure-img class from the descriptive text.
• Removed figure-img from the class attribute in the two <Placeholder> code examples.

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